Abstract
It is important to clarify the concentration of heavy metals in aquatic organisms under normal condition in order to evaluate heavy metal pollution in environmental sea water from the change of heavy metal contents in the organisms. For this purpose the normal levels of a few heavy metals in the cultured scallops, oysters and abalones were determined from the relationship between the body weight and the concentration of heavy metals. The results obtained showed that the concentration of each heavy metal in the soft parts increased with the increase of body weight. The relationship was especially significant in the mid-gut gland including stomach of scallops. These results suggest the existance of a characteristic pattern of heavy metal accumlation for each species, and the pattern observed in the mid-gut gland of scallops together with that in the soft parts may be available as a biological index for the evaluation of heavy metal pollution in environmental sea water.
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